XI-8F328P Arduino NANO 5V/ 3.3 volt version

USB on board makes it more convenient to use.
The 8F328D can be powered by 3V3 and 5V, operating at 16M frequencies with excellent levels of compatibility.
Built-in high precision RC, does not require an external crystal.
Super simple circuit design.
12 bit ADC (analog to digital conversion)
Bring DAC
Own GUID (unique ID) can be used for chip program encryption
Comes with an internal 1.024V/2.048V/4.096V + 1% calibration reference voltage source.